1. 长方形的;矩形的
Something that is rectangular is shaped like a rectangle.

1. having a set of mutually perpendicular axes
meeting at right angles

e.g. wind and sea may displace the ship's center of gravity along three orthogonal axes
a rectangular Cartesian coordinate system

Synonym: orthogonal

2. having four right angles

e.g. a rectangular figure twice as long as it is wide